JPS59843B2 - switching control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching control device used in a system in which two control devices commonly control a plurality of input/output devices.

In a system including two control devices and in which a plurality of input/output devices are commonly controlled by the control device, in order to switch the drive circuit of the input/output device by one of the two control devices, It used a relay circuit.

Conventionally, in a switching circuit using this relay, two switching relays were provided for each input/output device. This will be explained using a diagram. FIG. 1 is an explanatory diagram of a conventional switching control device, FIG. 1a is a block diagram, and FIG. 1 is a circuit diagram.
is a control device, 2 is a switching control device, 3 is a drive circuit, 4 is an input/output device, A, B are identification symbols of the control device, A0, AI,
B1, Br, An, An', Bn, Bn' are switching command signals, CA, CB are control lines, D, E are control relays, 11
, In is the identification symbol of the input/output device, P1, Pn is the identification symbol of the drive circuit, R4, Rr, Rn, Rn' are switching relays, SA, SB are switching timing signals, a, b, d, e,
rl and rf are relay contacts, and p is a drive line. In FIG. 1a, relays R4 and Rn of the switching control device 2 are switching relays, and relays Rr and Rn' are reset relays. As is clear from Figure 1a, conventionally 1
In order to switch between two systems of drive circuits P and input/output devices I, a total of two switching relays and one reset relay were required. In addition to this, control relays D and E (two in total) were provided for common control. The operation of a conventional switching control device will be explained using diagrams. In Figure 1a,
When control device A uses the input/output device, switching timing signal SA is applied to relay D, and switching command signals A1 to An are applied to switching relays R1 to Rn. FIG. 1 is a circuit diagram explaining the control operation, and is a circuit diagram of the control device A.
A switching timing signal SA from is given to the control relay D, and a switching command signal A0 is similarly given to the switching relay R1. Then, the contact d is turned ON, the relay R1 is activated, and the contact rl is also turned ON, while the contact 4 on the relay Rr side is turned OFF. Although not shown, the drive circuit P1 is connected to the drive contact a side by an AND circuit of the activation of the relay R1 and the signal that generates the command signal A1, and the drive circuit P1 is connected to the leg restraint device A. Next, when the input/output device is disconnected from the A system, a switching command signal Af is applied from the control device A to the reset relay R1', and a switching timing signal SA is applied to the control relay D. Therefore, control relay D works, and contact d of reset relay Rf goes to 0.
N, contact r1' of relay R( becomes 0N, and contact rl of switching relay R1 becomes 0FF. Therefore, switching relay R1 becomes 0FF, so drive contact a
is separated. Next, the switching timing signal SB is given from the control device B to the control relay E, and the switching command command signal B1 is given to the switching relay R1&, so that the same circuit operation as described above is performed, and the driving contact b becomes ON, the drive circuit P1 is connected to the control device B, and the input/output device 11 is controlled by the control device B. As is clear from the above, the conventional switching control device requires two control relays for common control and two switching relays for switching one system of input/output devices.

Therefore, as the number of input/output devices (n) increases, the number of switching relays increases by 2n times, and as the value of n increases,
This has the disadvantage that the total number of relays (2n+2) increases and the switching control device becomes bulky. The present invention has been made in order to solve the above-mentioned drawbacks, and aims to provide a switching control device that can switch one system of input/output devices using one relay.

The present invention provides an input/output device in a switching control device that includes two control devices (A and B) and switches and connects a plurality of input/output devices to either one of the two control devices A and B. Each system has one switching relay for switching to either control device A or B, and has four control relays for controlling the switching relay, and is switched by the control relay. This switching control device is characterized in that it switches and connects a plurality of input/output devices to two control devices by commonly controlling a group of relays.

The present invention will be explained below with reference to the drawings.

FIG. 2 is a block diagram illustrating an embodiment of the present invention, in which 1 is a control device, 2 is a switching control device, 3 is a drive circuit, and 4 is a block diagram illustrating an embodiment of the present invention.
is the input/output device, A and B are the identification symbols of the control device, Al, A
n, Bl, Bn are switching command signals, CA, CB are control lines,
D, E, F, G are control relays, 11, In are input/output device identification symbols, Pl, pn are 1 drive circuit identification symbols, R
l and Rn are identification symbols of switching relays, SA and SB are switching timing signals, A and b are contacts, and p is one drive line.
FIG. 2 is a block diagram illustrating the function of switching and controlling a plurality of (n) input/output devices, but only the first and nth systems are shown, and the others are omitted. As a switching relay for the drive circuit and the input/output device, one relay is used for each system, so n relays are used for n systems. As a relay that commonly controls the switching relays, control relay D,
It has four E, F, and G. Therefore, the number of relays that switch n input/output devices may be (n+4),
Compared to the conventional system (2n+2), this method has the advantage that even if the value of n is large, the required number of relays is almost n times as large. In FIG. 2, when the control device A uses the input/output device groups 11 to In, it emits a switching timing signal SA, this signal is given to the control relay D, and the switching command signals A1 to An are sent to the switching relays. given to R1 to Rn. Conversely, when control device B uses input/output device groups 11 to In, it applies switching timing signal SB to control relay E,
Switching connection control is performed by applying switching command signals B, -Bn to switching relays R1 to Rn. The operation of this circuit will be explained using diagrams. FIG. 3 is an explanatory diagram of one embodiment of the present invention, where a is a circuit diagram, B and C are time charts, AlBl is a switching command signal, CA and CB are control lines, and D
, E, F, G are control relays, R1 is a switching relay, S
A, SB are switching timing signals, A, b, dl, d2,
d3tsu e1 wo E2tsu E3) Fllf2Cf3 la g1 la G
2》G3 is a contact point, p is a drive line.

Referring to FIG. 3a, first, a case will be described in which a switching timing signal SA and a switching command signal A are provided from the control device A. The control relay D is activated by the switching timing signal SA, and the contacts Dl, d2, and d3 become ON. Therefore, relay R1 works, contact r1 becomes 0N, then relay F works, contact f1 becomes 0FF, and contacts F2 and f3 become 0N.
N, and relay G operates. Therefore, the contacts Gl,g
2 is 0FF1 Contact G3 is 0N 0 Therefore, relay F is set, so contact f1 is 0N and contacts F2 and f3
becomes 0FF, and relay D is set. Therefore, contact D3 becomes 0FF, and relay G is set. This time relationship is shown in the time chart of FIG. 3b.
FIG. 3b shows the process in which the switching relay R1 moves from the return state to the operating state. Similarly, Fig. 3c shows the process of switching relay R1 returning from the operating state to the return state, but the operation of each relay D, E, F, and G is shown in Fig. 3b.
However, when relay F operates, signal A1 (B
The difference is that relay R1 returns to normal because 1) is not input. As is clear from the above, the present invention uses one switching relay for switching one input/output device to one of two control devices, and a control relay that commonly controls the switching relay. This is a switching control device equipped with four.

Therefore, when switching between n input/output devices, (n+4)
It suffices to have several relays. In contrast, the conventional system requires (2n+2) relays, and when the number of input/output devices is large, the difference in the required number of relays becomes large. The attached table shows the difference in the required number of relays. In the table, there is no difference when the number of input/output devices is 2 or less, but when the number reaches 50, the conventional method 10
While two relays are required, the present invention requires 54 relays.
It is clear that the effect of the present invention is remarkable.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional switching control device, FIG. 2 is a block diagram explaining an embodiment of the present invention, and FIG. 3 is a circuit diagram and time chart explaining an embodiment of the present invention. ,
The symbols used in the figure are as follows. 1... Control device, 2... Switching control device, 3... Drive circuit, 4... Input/output device, A, B...・Identification symbol of control device, Al, A {
,B,Bf,An,An/,Bn,Bn'...
Switching command signal, CA, CB... Control line, D, E
,F,G...Control relay 11,In...
...Identification symbol of input/output device, Rl, R'I, Rn, R
n/・・・・・・Identification symbol of switching relay, SA, SB
・・・・・・Switching timing signal, Atsu Bldl D2
La D3 La e1 La E2 te3 Tsu f1 F2 La F3 wo GlF
g2゜G3゜゜゜゜゜゜゜゜゜゜゜゜゜ Contact, P...1 drive line.

Claims (1)

[Claims] 1 It has an input/output device, a pair of control devices that control the input/output device, and a switch that switches and connects the input/output device to one of the control devices, and a switching command signal output from each control device. and a switching control system that controls the switching of the switch using a switching timing signal, which controls switching of the switch when the switching command signal is input, and includes a switching relay means provided with a self-holding contact, and a switching relay means of each control device. A first contact point operated by a switching timing signal to connect a switching command signal generation source of the control device and the switching relay means, and inputting a switching command signal to the switching relay means to cause the switching relay means to self-hold. relay means, and a contact that operates in response to the operation of the first relay means and releases the self-holding of the switching relay means, the switching relay is operated via the contact of the first relay means during the operation period. A switching control device comprising: second relay means for restoring the switching relay means when the switching command signal is not input to the means.